My preseason prediction was Celtics/Spurs in the Finals. It looked like a dumb prediction most of the year (and might still be given that Boston has to get through CLE and ORL). But the Spurs pick isn't looking so ridiculous right now.
Of all the higher Western seeds, I do think Phoenix will advance (Nuggets are done, Mavs are done, and I really do think the Lakers will lose). I don't think I can predict a Suns/Spurs matchup - it'll be very close, but I will say that I think the winner of Suns/Spurs wins the West.